Well that is a dbl chk, lmao. Woww, surprised that the installer didnt put tees and half inch ball valves for testcocks and maybe some sch.40 gate valves for isolation.

The sad part. Is i have had employees of a water purveyor tell a homeowner (that was contemplating installing their own system) that there was already a double check on their meter taps. (Referencing a check valve like one of those above.) I had to show them an actual double check to get them to believe me.

You stole my words, I was going to say same thing. It is a double check... Lol